I made a dust hood that works very well. I wrote up a "It worked for me" article that was published in American Lutherie last year. When I get on my PC today I'll post a photo, but I think I posted it here somewhere already.

Here is what I did. Thai take-out container: hole in the bottom to pass the chuck through, hole in the side for the vacuum hose, neoprene "sweep" around the edges. I chuck the Safe-T-Planer just below the sweep. It works very well for thicknessing (tops, backs, sides) when the work and table are close to the sweep. When leveling thicker stock, a bit of dust escapes, but only because the hood is off the table. This works well for sanding discs, too.

Sorry, Dennis, but that just won't work. It's Asian take-out or nuthin!

Actually, I spent a lot of time thinking about this, and auditioned a couple different candidates. The first container I tried was a hard plastic iced tea pitcher that I picked up at a second-hand store. It was too hard and and brittle and was difficult to cut to height and for the dust hose. I considered a milk jug, but it was too flimsy. These take-out tubs from the Thai place down the street are great, nearly Rubbermaid quality, and my wife saves them for left-over containers and freezer jam. I'm sure your container would work fine, but it needs to be fairly rigid so that it doesn't contort or split when you attach the hose.